Metal Roof Thermal Expansion

Metal roof systems can be the least forgiving of all roof sys tems if provisions for expansion and contraction are neglected.

Metal roof thermal expansion.

The sun hits your roof and heats it up. The rate of thermal movement varies by the type of metal installed and temperature of the base metal. A formed metal component anchored to the building substrate used to secure two pieces of metal to each other or to secure metal shingles or standing seam roofing but can move with the metals expansion to allow for thermal movement. Standing seam roof systems were designed to allow roof movement and should be specified when roof movement is expected to be a problem due to the design of the.

Get free shipping on qualified metal roofing or buy online pick up in store today in the building materials department. Years ago as a young builder i almost got blown off a roof while trying to carry a sheet of 4 by 8 plywood. Also the surface temperature of metal roofing materials can range from 25 degrees. It s thermal expansion and contraction.

A material experiencing a rise or decrease of temperature expands or contracts respectively this poses an interesting challenge when it comes to designing metal panel roof assemblies. Thermal expansion contraction is responsible for most roof leaks. The wind pressure against a roof or an entire home can be enormous. Expansion and contraction factors often are overlooked or regarded as insignifi cant in metal roof system design and construction.

For example expansion and contrac tion can cause metal components to. The term thermal movement refers to a material s dimensional changes resulting from temperature swings. It might be the wind. In the long run a properly designed weather tight roof will cost less than an improperly designed leaky low cost roof.

It is important to note ambient air temperature will differ from the temperature of the metal and direct solar radia tion plays a major role in this process. As the lumber expands it moves and it will rub against other pieces of wood that aren t moving at the same rate.